Excretory Products and Their Elimination

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DÏSØRDËR ØF ËXÇRËTØRÝ SÝSTËM

Uremia: Accumulation of urea in

blood which may lead to kidney failure.

Renal calculi:

Stone or insoluble mass of crystallized

salts (oxalates, etc.) formed within the

kidney.

Glomerulonephritis:

Inflammation of glomeruli.

HËMØDÏÅLÝSÏS :

Dialyzer inflow

pressure monitor

Clean blood

returned to

body

Blood

removed for

cleaning

Heparin

infusion

Blood pump

Inflow pressure

monitor

Dialysis

fluid removed

Dialysis

fluid in

Air trap

Dialyzer

Arterial

pressure

monitor

In patients with uremia, urea is removed by hemodialysis.

The porous cellophane membrane of the tube allows the passage of molecules

based on concentration gradient.

The dialyzing unit (artificial kidney) contains a coiled cellophane tube surrounded

by dialyzing fluid . It has same composition of plasma except nitrogenous wastes.

Blood drained from a convenient artery is pumped into dialyzing unit after adding

anticoagulant like heparin.